One of Snapchat's biggest appeals is the feature where photos and videos disappear after they're sent. However, as with most things, there's a loophole to that.

If a parent is curious about what their child is sending, they can purchase an mSpy package for $70 a month. The software sends all Snapchats, and who they are calling, texting, emailing, and where they are to their own device. The parent can also see websites their child is surfing, what apps they download, and their calendars, according to the mSpy website.

The premium package is the only one that includes Snapchat, but for a little less, spying capabilities are available in a basic $40 package. There is also a desktop package available for $20.

The software must be downloaded on the child's device, as well as the parent's. The only difference is that on the child's device there is no icon, so they will not know they are being spied on.  

The mSpy website advises that it's illegal to download this software on someone's phone without their consent in the U.S., unless they are a minor.

According to CNN, 2 million people are using the software and more than a third of them are parents.

The software is also marketed towards businesses to use on their employee's work devices.